The man has delayed the Sahara desertification of 500 years


The human activity of pastoralism has probably delayed the birth of the Sahara by about 500 years as we know it now and has therefore not accelerated, as was believed, the decline of the "Verde Sahara", ie the "wet" African period, characterized by the presence of lakes and vegetation where today there is only desert. This is supported by research conducted by the University College London (UCL) and by King's College London, published in Nature Communications. About 8,000 years ago, the area of ​​today's Sahara was not desert but constituted a vital ecosystem, populated by hunters, gatherers and fishermen. As soon as the Earth's orbit slowly changed, the rain began to decline and a new decline process began towards the disappearance. About 5,500 years ago, the ecosystem in the Sahara went to meet the final decay that opened its doors to the desert of now. Pastoralism, practiced in a nomadic or semi-nomadic way, developed in the Sahara from about 1,000 years before that outcome.

Based on variables such as vegetation, rain, and other processes such as increasing energy from the Sun and carbon dioxide in the atmosphere, gathered in a model, researchers conclude that the "Green Sahara" would have to disappear before. This suggests that pastors remained active longer than previously believed and the techniques used helped them adapt to environmental changes. "Despite the very inhospitable conditions of the Sahara today - concludes Katie Manning of King's College - it is not difficult to find evidence of human occupation for 11,000 years - it is likely that the typical strategies used by pastors, such as seasonal migrations and selective pastures , have helped to conserve an otherwise deteriorating ecosystem ".

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